I'm very glad I discovered LambdaTek, and was very pleased with the website, service and price. I purchased a Microsoft Natural 4000 keyboard, and saw that this was the newest model (2012), but was disappointed to see that Microsoft haven't improved the longstanding faults of sticking/unresponsive keys, particularly the spacebar, and no doubt the letters will rub off very soon. For someone with arthritis, the effort needed for some of the keys is simply ridiculous compared to a normal keyboard, which I cannot use. But this is not LambdaTek's fault. Unfortunately there's not enough competition in ergonomic keyboards! But I will certainly use LambdaTek again and would recommend the company.